We examine the relation of the mode coupling theory of glassforming liquid dynamics to the Gibbs-Goldstein landscape picture of relaxation, and identify, using both scaling relationships and thermodynamic calculations, where the crossover between the two domains occurs. This "landscape" approach is then applied to chain polymers, using a neglected relation between the WLF C1 parameter and the high frequency limit for relaxation, to establish the characteristic temperature of the landscape ground state and the appropriate fragility parameters. A problem with the relation between thermodynamic to relaxational assessments of the landscape "height" is used to focus attention on a problem with the heat capacity changes at Tg in the case of chain polymer melts and their glasses.
|Original language||English (US)|
|Number of pages||16|
|Journal||ACS Symposium Series|
|State||Published - Dec 1 1998|
ASJC Scopus subject areas
- Chemical Engineering(all)